In focus: The incredible shoals of sardines

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These breathtaking images show a vast school of sardines
captured by stunned divers exploring a reef in the Philippines.

The magnificent spectacle, known as a "sardine run" sees the
silver fish swimming in formation to create a shimmering wall in
this annual migration.

The shoal, captured by Nadya Kulagina in the last dive of her
trip, was spotted off the coast of Pescador Island.

It occurs in the region from May through to July when billions
of sardines spawn in the cool waters of southern Africa and move
north along the east coast and into the Indian Ocean.